Discovery of a z=0.65 post-starburst BAL quasar in the DES supernova fields

作者：Mudd Dale; Martini Paul; Tie Suk Sien; Lidman Chris; McMahon Richard; Banerji Manda; Davis Tamara; Peterson Bradley; Sharp Rob; Seymour Nicholas; Childress Michael; Lewis Geraint; Tucker Brad; Yuan Fang; Abbot Tim; Abdalla Filipe; Allam Sahar; Benoit Levy Aurelien; Bertin Emmanuel; Brooks David; Camero Rosell A; Kind Matias Carrasco; Carretero Jorge; da Costa Luiz N; Desai Shantanu; Diehl Thomas; Eifler Tim; Finley David; Flaugher Brenna; Glazebrook Karl

来源：Monthly Notices of the Royal Astronomical Society, 2017, 468(3): 3682-3688.

DOI：10.1093/mnras/stx708

• galaxies: active
• quasars: absorption lines
• galaxies: starburst

We present the discovery of a z = 0.65 low-ionization broad absorption line (LoBAL) quasar in a post-starburst galaxy in data from the Dark Energy Survey (DES) and spectroscopy from the Australian Dark Energy Survey (OzDES). LoBAL quasars are a minority of all BALs, and rarer still is that this object also exhibits broad Fe II (an FeLoBAL) and Balmer absorption. This is the first BAL quasar that has signatures of recently truncated star formation, which we estimate ended about 40 Myr ago. The characteristic signatures of an FeLoBAL require high column densities, which could be explained by the emergence of a young quasar from an early, dust-enshrouded phase, or by clouds compressed by a blast wave. The age of the starburst component is comparable to estimates of the lifetime of quasars, so if we assume the quasar activity is related to the truncation of the star formation, this object is better explained by the blast wave scenario.

• 出版日期2017-7
• 单位Univ Estadual Paulista